Mailbox bank



FIG. 1 is a perspective view of a mailbox bank showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof; and,

FIG. 6 is a top view thereof.

The undisclosed bottom is unornamented. 

The ornamental design for a mailbox bank, as shown and described. 